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<h1 id="structure">Structure</h1>
<p>The picture below presents the structure of the library, together with its clients and servers.
The boxes filled with cyan represent components that are part of the library distribution.</p>
<p><img alt="Structure Chart" src="../images/structure.png" /></p>
<p>The SOCI library is extensible in the following ways:</p>
<ul>
<li>More backends can be added to target various database servers.</li>
<li>More interfaces can be defined on top of common backend interface.</li>
<li>Other languages can use the <a href="../interfaces/">simple interface</a>, which was designed specifically for the "C" calling convention to ensure easy binding.</li>
</ul>
<p>The core part of the library and the backend interface definition are placed
in the <code>core</code> directory of the library distribution. The <code>soci-backend.h</code> file
is an internal abstract interface to the actual backends, which are needed to
perform operations on the given database server. Normally, the C++ client
program needs to interface with the <code>soci.h</code> header and the header(s) relevant
to the given backend(s) (for example, <code>soci-oracle.h</code>), although with dynamic
backend loading this can be avoided. It is possible for the same program to use
many backends at the same time.</p>
<p>Everything in SOCI is declared in the namespace <code>soci</code>. All code examples
presented in this documentation assume that your code begins with something like:</p>
<pre><code class="language-cpp">#include <soci/soci.h>
// other includes if necessary
using namespace soci;
// ...
</code></pre>
<p>Note: In simple programs, <code>#include</code> for the relevant backend is needed only
in the file where the <code>session</code> object is created with explicit name of
the backend factory. The example program on the <a href="../">previous page</a>
shows the appropriate <code>#include</code> directive for the Oracle backend.
It is also possible to name backends at run-time as part of the connection
string, in which case no backend-specific <code>#include</code> directive is necessary.</p></div>
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